Important Points: Computer Programming

Computer Programming/Modular Programming/File Handling

1. Modular Programming: Process of writing program in multiple modules
2. Main Module: The main part of the program inside which several sub modules are created
3. Sub program: A group of statements written in a separate module to perform one or more tasks
4. Formal Parameter: Parameter used while declaring and defining sub-program or user-defined functions 
5. Actual Parameter: Parameter used while calling sub-procedure or user defined function 
6. Local Variable: The variable which is recognized only inside the module where it is declared 
7. Global Variable: The variable which can be accessed from all the modules.
8. File Handling: File handling is a mechanism to work with file so that we can read and write data from and into a disk file through QBASIC program.
9. Output Mode: Output mode creates a new file and opens it to store data.
10. Append Mode: Append mode opens an existing file to add records.
11. Input Mode: Input mode opens and existing file to read records.
12.  File management command: File management command operates various task in a program. (Ex. FILES, MKDIR, CHDIR, RMDIR, NAME...AS, KILL and SYSTEM)